CN106277286B - Method for eliminating viscous swelling of activated sludge in biochemical system - Google Patents
Method for eliminating viscous swelling of activated sludge in biochemical system Download PDFInfo
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- CN106277286B CN106277286B CN201610759034.8A CN201610759034A CN106277286B CN 106277286 B CN106277286 B CN 106277286B CN 201610759034 A CN201610759034 A CN 201610759034A CN 106277286 B CN106277286 B CN 106277286B
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- 229910052700 potassium Inorganic materials 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/006—Regulation methods for biological treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/342—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the enzymes used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Activated Sludge Processes (AREA)
Abstract
A method for eliminating activated sludge viscous swelling in a biochemical system comprises the following steps: the viscous expansion of the activated sludge in the biochemical system is eliminated by adopting the method of changing the process, adding a microorganism growth promoter or adding biological enzyme; the process change measures are selected from: changing the activated sludge process into a biological membrane process; changing the activated sludge process into a hydrolytic acidification and aerobic process; the activated sludge process is changed into a micro-aerobic process. By adopting the method, the growth and proliferation conditions of microbial flora can be changed, the zoogloea structure of the sludge is improved, and the viscosity of the sludge is reduced, so that the settleability of the sludge is improved, and the viscous expansion of the sludge is eliminated.
Description
Technical Field
The invention belongs to the technical field of biochemical treatment of wastewater, and particularly relates to a method for eliminating viscous expansion of sludge in a biochemical system.
Background
The activated sludge method for treating wastewater is the core and the foundation of a biochemical method. The expansion phenomenon of activated sludge is easily caused due to improper wastewater quality and process parameters. According to statistics, more than 50% of sewage stations adopting biochemical processes generate sludge bulking. The serious sludge expansion causes sludge loss and even system breakdown to influence the operation stability of the biochemical system.
The method comprises the steps of performing sludge bulking including filamentous bacterium bulking and viscous bulking, wherein filamentous bacterium bulking generally occurs more, and has a treatment measure and a treatment principle measure for treating filamentous bacterium bulking, wherein the treatment principle measure comprises the steps of improving pH to kill filamentous bacteria, adding flocculating agent/clay and the like to improve sludge settleability, improving sludge reflux ratio and the like, the treatment principle measure comprises the steps of changing ① to a single aerobic process, increasing an anoxic section or a high-load sludge selection area in a biochemical pond, increasing dissolved oxygen in the biochemical pond by ②, increasing sludge load by ③, balancing nutrition proportion by ④ and the like, and different treatment measures required by different filamentous bacterium bulking are relatively more in research and engineering practice.
Compared with filamentous bacterium bulking, the viscous bulking of the sludge has lower probability of occurrence and is not easy to be emphasized in actual engineering; if the treatment happens, the treatment is difficult. Viscous sludge bulking typically occurs in the treatment of relatively simple quality wastewater and high salinity wastewater. At present, the mechanism of the viscous expansion of the sludge is not uniformly known. After the viscous expansion of the sludge occurs in some sewage stations, the reason for the viscous expansion of the sludge cannot be found for a long time, and an effective measure for eliminating the viscous expansion of the sludge cannot be found; the sewage station does not reach the design load.
Disclosure of Invention
The invention aims to solve the technical problem of viscous sludge bulking in a biochemical system and provides a method for eliminating the viscous sludge bulking in the biochemical system.
The technical problem to be solved by the invention is realized by the following scheme. The invention relates to a method for eliminating viscous swelling of activated sludge in a biochemical system, which is characterized by comprising the following steps: the viscous expansion of the activated sludge in the biochemical system is eliminated by adopting the method of changing the process, adding a microorganism growth promoter or adding biological enzyme; the process change measures are selected from:
(1) changing the activated sludge process into a biological membrane process;
(2) changing the activated sludge process into a hydrolytic acidification and aerobic process;
(3) the activated sludge process is changed into a micro-aerobic process.
The invention relates to a method for eliminating viscous swelling of activated sludge in a biochemical system, which further adopts the preferable technical scheme that: the biofilm process is a contact oxidation process or MBBR.
The invention relates to a method for eliminating viscous swelling of activated sludge in a biochemical system, which further adopts the preferable technical scheme that: the sludge load of the 'hydrolytic acidification and aerobic process' is less than or equal to 0.3 kgCOD/(kgMLSS.d).
The invention relates to a method for eliminating viscous swelling of activated sludge in a biochemical system, which further adopts the preferable technical scheme that: the dissolved oxygen in the micro-aerobic process is 0.1-0.3 mg/L.
The invention relates to a method for eliminating viscous swelling of activated sludge in a biochemical system, which further adopts the preferable technical scheme that: the sludge load in the micro-aerobic process is less than or equal to 0.2 kgCOD/(kgMLSS.d). The return flow of the mixed liquid or the return flow of the sludge is increased, and the local sludge load in the biochemical pond is prevented from exceeding 0.2 kgCOD/(kgMLSS.d).
The invention relates to a method for eliminating viscous swelling of activated sludge in a biochemical system, which further adopts the preferable technical scheme that: the microbial nutrition promoter is selected from one or more of yeast extract powder, corn steep liquor dry powder, molasses powder, beef extract dry powder and tryptone dry powder, or is a soil extract under the condition of pH 5.0-8.0.
The invention relates to a method for eliminating viscous swelling of activated sludge in a biochemical system, which further adopts the preferable technical scheme that: the biological enzyme is one or more of polysaccharidase, peptidase and protease.
The invention relates to a method for eliminating viscous swelling of activated sludge in a biochemical system, which further adopts the preferable technical scheme that: the components of the microbial nutrition promoter comprise: based on the weight portion of the mixture ratio,
40-50 parts of corn steep liquor dry powder; 10-20 parts of honey powder;
5-10 parts of nutrient salt; 0.5-1 of trace elements.
The components of the microbial nutrition promoter can also comprise 5-10 parts by weight of powdered activated carbon and/or 5-10 parts by weight of yeast extract powder.
The preferred components of the microbial nutrition enhancer are:
44-46 parts of corn steep liquor dry powder; 13-17 parts of molasses powder;
6-8 parts of nutrient salt; 0.6-0.8% of trace elements;
7-9 parts of powdered activated carbon; 6-8 parts of yeast extract powder.
The most preferred components of the microbial nutrition enhancer are:
corn steep liquor dry powder 45; 15 parts of honey powder;
nutrient salt 7; 0.7 of trace elements;
powdered activated carbon 8; and 7, yeast extract powder.
The microbial growth promoter of the present invention may be any one of those disclosed in the prior art or commercially available, and preferably any one of those disclosed in the present invention. In the microbial growth promoter disclosed by the invention, the nutrient salt and the trace elements can adopt conventional nutrient salts and trace elements in the prior art. The main nutrient salts include N, S, P, K, Ca and Mg salts, and the trace elements include Fe, Si, Zn, Cu, I, Br, Se, Mn, etc. The components are common substances in the market, and the price is low. Wherein the corn steep liquor dry powder is prepared by low-temperature and instant heating and spray drying of residual slurry obtained by corn fermentation in the corn fermentation process, and contains water-soluble protein, P, sulfite, vitamins, trace elements and other nutrient elements.
The molasses powder is the residual product of sugar production, contains water-soluble protein, fulvic acid, potassium oxide 11.7%, nitrogen 3%, phosphorus 0.4%, crude protein content 19.78%, amino acid 8.51%, and a large amount of B vitamins, vitamin C, inositol, polysaccharide, etc., has pH of 5-6, has activity 10 times of that of natural humic acid, and also contains multiple vitamins, trace elements, mycoprotein, nucleic acid, surfactant, growth factor (bioactive substance), etc.
The yeast extract powder is amino acid, peptide, micromolecular protein, nucleotide, sugar, vitamin and flavor compound obtained by hydrolyzing substances such as protein in yeast cell wall powder, and is rich in trace elements, active substances and growth factors. The yeast extract powder is divided into beer yeast extract powder and bread yeast extract powder.
Peptone is pale yellow powder obtained by hydrolyzing meat, casein or gelatin with acid or protease, and drying, contains organic nitrogen compounds, vitamins and saccharides, and can provide nutrients such as C source, N source, growth factor, etc. for microorganisms.
The method creates various microbial growth environments through process change, and is beneficial to improving the diversity of microbial floras in a biochemical system, thereby improving the sludge floc structure and improving the sedimentation performance of the sludge floc structure. Through the adjustment of process parameters, the metabolism rate of microbial cells is reduced, and the synthesis and accumulation rate of extracellular polymers is reduced. The microbial growth promoter is added to provide sufficient nutrient elements and growth factors for the growth and proliferation of cells, promote the decomposition of the cells on organic matters in wastewater, promote the growth of certain microbial flora and improve the diversity of the microbial flora. The addition of the biological enzyme is helpful to decompose extracellular polymer EPS and reduce the cell viscosity, thereby improving the sludge settleability.
Compared with the prior art, the method has the beneficial effects that:
the method of the invention improves the diversity of degradation flora in a biochemical system and reduces the concentration of Extracellular Polymeric Substance (EPS), thereby improving the structure of sludge zoogloea and improving the sludge activity and the sludge sedimentation performance. Can effectively solve the problem of viscous expansion of the sludge of the biochemical system. Can be adjusted based on the existing biochemical system, and has small investment and quick response.
Detailed description of the invention
The following further describes particular embodiments of the present invention to facilitate further understanding of the present invention by those skilled in the art, and does not constitute a limitation to the right thereof.
Example 1, a method for eliminating viscous swelling of activated sludge in a biochemical system: the viscous expansion of the activated sludge in the biochemical system is eliminated by adopting the method of changing the process, adding a microorganism growth promoter or adding biological enzyme; the process change measures are selected from:
(1) changing the activated sludge process into a biological membrane process;
(2) changing the activated sludge process into a hydrolytic acidification and aerobic process;
(3) the activated sludge process is changed into a micro-aerobic process.
Example 2, the method for eliminating the viscous swelling of the activated sludge in the biochemical system described in example 1: the biofilm process is a contact oxidation process or MBBR.
Example 3, the method for eliminating the viscous swelling of the activated sludge in the biochemical system described in example 1: the dissolved oxygen in the micro-aerobic process is 0.1-0.3 mg/L. The sludge load in the micro-aerobic process is less than or equal to 0.2kgCOD/(kgMLSS.d), the return flow of the mixed liquor or the return flow of the sludge is increased, and the local sludge load in the biochemical pool is prevented from exceeding 0.2 kgCOD/(kgMLSS.d).
Example 4, the method for eliminating the viscous swelling of the activated sludge in the biochemical system described in example 1: the sludge load of the 'hydrolytic acidification and aerobic process' is less than or equal to 0.3 kgCOD/(kgMLSS.d).
Example 5, example 1-4 the method for eliminating viscous swelling of activated sludge in a biochemical system, comprising: the microbial nutrition promoter is selected from one of yeast extract powder, corn steep liquor dry powder, molasses powder, beef extract dry powder and tryptone dry powder, or is a soil extract under the condition of pH 5.0-8.0.
Example 6, the method for eliminating viscous swelling of activated sludge in biochemical system according to any one of examples 1 to 4: the microorganism nutrition promoter is selected from any 2 or 3 of yeast extract powder, corn steep liquor dry powder, molasses powder, beef extract dry powder and tryptone dry powder.
Example 7, the method for eliminating viscous swelling of activated sludge in a biochemical system according to any one of examples 1 to 4: the biological enzyme is one or more of polysaccharidase, peptidase and protease.
Example 8, the method for eliminating viscous swelling of activated sludge in a biochemical system according to any one of examples 1 to 4, wherein: the components of the microbial nutrition promoter comprise: based on the weight portion of the mixture ratio,
dry corn steep liquor powder 40; 10 parts of honey powder;
5, nutrient salt; 0.5 of trace elements.
Example 9, the method for eliminating viscous swelling of activated sludge in a biochemical system according to any one of examples 1 to 4: the components of the microbial nutrition promoter comprise: based on the weight portion of the mixture ratio,
50 parts of corn steep liquor dry powder; 20 parts of honey powder;
10 of nutrient salt; trace element 1.
Example 10, the method for eliminating the viscous swelling of the activated sludge in the biochemical system described in example 9: the components of the microbial nutrition promoter also comprise 5 parts by weight of powdered activated carbon and/or 5 parts by weight of yeast extract powder.
Example 11, the method for eliminating the viscous swelling of the activated sludge in the biochemical system described in example 8: the components of the microbial nutrition promoter also comprise 10 parts by weight of powdered activated carbon and/or 10 parts by weight of yeast extract powder.
Example 12, the method for eliminating viscous swelling of activated sludge in a biochemical system according to any one of examples 1 to 4, wherein: the microbial nutrition promoter comprises the following components:
dry corn steep liquor 44; 13 of honey powder;
6, nutrient salt; 0.6 of trace elements;
powdered activated carbon 7; and 6, yeast extract powder.
Example 13, the method for eliminating viscous swelling of activated sludge in a biochemical system according to any one of examples 1 to 4: the microbial nutrition promoter comprises the following components:
corn steep liquor dry powder 46; molasses powder 17;
8, nutrient salt; 0.8 of trace elements;
powdered activated carbon 9; and 8, yeast extract powder.
Example 14, the method for eliminating viscous swelling of activated sludge in biochemical system according to any one of examples 1 to 4: the microbial nutrition promoter comprises the following components:
corn steep liquor dry powder 45; 15 parts of honey powder;
nutrient salt 7; 0.7 of trace elements;
powdered activated carbon 8; and 7, yeast extract powder.
Example 15: experiment for eliminating viscous swelling of sludge in acetic acid wastewater
A certain sewage treatment station treats acetic acid wastewater, the COD of inlet water is 1500mg/L, the sludge concentration is 2000mg/L, the retention time is 24 hours, sludge bulking occurs, no filamentous bacteria are detected by a microscope, and the SVI exceeds 400.
Viscous swell elimination: and adding MBBR suspended filler into the biochemical tank, wherein the filling ratio is 30%, and the dissolved oxygen is kept at 4.0-6.0 mg/L, and adjusting for 30d to ensure that all sludge is attached to and grows on the surface of the MBBR filler, the effluent is clear, and the problem of viscous expansion of the sludge is solved.
Example 16: experiment for eliminating viscous swelling of sludge in acetic acid wastewater
A certain sewage treatment station treats acetic acid wastewater, the COD of inlet water is 1500mg/L, the sludge concentration is 2000mg/L, the retention time is 18h, sludge bulking occurs, no filamentous bacteria are detected by microscopy, and the SVI exceeds 400.
Viscous swell elimination: and adding sludge with good sedimentation performance into the biochemical tank to enable the concentration of the sludge to reach more than 8000mg/L, so that the sludge load of the system is reduced to 0.2kgCOD/(kgMLSS.d), meanwhile, the dissolved oxygen is maintained to be 1.0-2.0 mg/L, the dissolved oxygen is kept to be 4.0-6.0 mg/L, and after stable operation for 30d, the SVI is always maintained below 150 and is not increased.
Example 17: experiment for eliminating viscous swelling of sludge in acetic acid wastewater
A certain sewage treatment station treats acetic acid wastewater, the COD of inlet water is 1500mg/L, the sludge concentration is 2000mg/L, the retention time is 18h, sludge bulking occurs, no filamentous bacteria are detected by microscopy, and the SVI exceeds 400.
Viscous swell elimination: adding corn steep liquor dry powder into the inlet water, adding COD 200mg/L, and simultaneously reducing the COD concentration of the inlet water for debugging to ensure that the sludge load does not exceed 0.5 kgCOD/(kgMLSS.d); gradually increasing the sludge concentration and keeping the sludge load not to exceed 0.5kgCOD/(kgMLSS.d) all the time. After 40 days, the sludge concentration is cultured to be more than 5000mg/L, and the SVI is gradually reduced to be less than 150 and kept stable.
Example 18: experiment for eliminating viscous swelling of sludge of sugar-containing wastewater
A certain sewage treatment station is used for treating the sugar-containing wastewater, the COD of the fed water is 6000mg/L, the biochemical process is a 3-section aerobic system, wherein the sludge viscosity expansion is generated between a first section system and a second section system, the SVI of the first section system exceeds 600, and the SVI of the second section system exceeds 400; the sludge concentration of the first section system is 1500mg/L, and the sludge concentration of the second section system is 2000 mg/L.
Viscous swell elimination: changing the first stage system into a hydrolysis acidification system, and only stirring; the second stage system is changed into a micro-aerobic system, and the dissolved oxygen is controlled to be less than 1.0 mg/L. After 50 days, the SVI of the first stage system gradually drops below 150, and the SVI of the second stage system drops below 90.
Example 19: experiment for eliminating viscous swelling of sludge of sugar-containing wastewater
A certain sewage treatment station is used for treating the sugar-containing wastewater, the COD of the fed water is 6000mg/L, the biochemical process is a 3-section aerobic system, wherein the sludge viscosity expansion is generated between a first section system and a second section system, the SVI of the first section system exceeds 600, and the SVI of the second section system exceeds 400; the sludge concentration of the first section system is 1500mg/L, the sludge concentration of the second section system is 2000mg/L, and the sludge viscosity in the system is relatively high.
Viscous swell elimination: adding contact oxidation filler in a first-stage system, and controlling the dissolved oxygen to be 2.0-4.0 mg/L; the second stage system is also added with contact oxidation filler, and the dissolved oxygen is controlled to be less than 1.0-2.0 mg/L. After 30 days, the activated sludge of the first section system and the activated sludge of the second section system are completely attached to the surface of the filler to grow, and the effluent is clear without viscous expansion of the sludge.
Example 20: experiment for eliminating viscous swelling of sludge of sugar-containing wastewater
A certain sewage treatment station is used for treating sample-containing wastewater, the COD of inlet water is 6000mg/L, the biochemical process is a 3-section aerobic system, wherein the sludge viscosity expansion is generated between a first section system and a second section system, the SVI of the first section system exceeds 600, and the SVI of the second section system exceeds 400; the sludge concentration of the first section system is 1500mg/L, and the sludge concentration of the second section system is 2000 mg/L.
Viscous swell elimination: in the first stage, the system is a micro-aerobic process, and dissolved oxygen is controlled to be 0.1-0.5 mg/L; the second stage system is an anoxic process, and dissolved oxygen is controlled to be 0.5-1.0 mg/L. After 30 days, the sludge concentration of the first stage system is increased to more than 4000mg/L, and the SVI is reduced to less than 80; the sludge concentration of the second stage system is increased to more than 4000mg/L, and the SVI is reduced to less than 100.
Example 21: experiment for eliminating viscous swelling of sludge of sebacic acid wastewater
And (3) treating the sebacic acid wastewater by a certain sewage treatment station, wherein the inlet water COD is 1400-2400 mg/L, the biochemical process is anoxic/aerobic, the residence time of an adjusting tank is 10h, the residence time of an anoxic tank is 7h, the residence time of an aerobic tank is 15h, the sludge concentration is 5500mg/L, the SVI exceeds 500, and the secondary sedimentation tank floats mud seriously.
Viscous swell elimination: the adjusting tank is added with a filler and an aeration system, the adjusting tank is transformed into an acidification adjusting tank, the anoxic tank is operated according to aeration, and the transformed process is a micro-aerobic hydrolysis acidification and aerobic process. Meanwhile, 1/2 is discharged from the existing sludge in the biochemical tank, and the sludge in the domestic sewage plant is supplemented to the sludge concentration of more than 6000 mg/L. The micro-aerobic acidification adjusting tank controls the dissolved oxygen to be 0.3-0.5 mg/L, and the aerobic tank controls the dissolved oxygen to be 1.0-2.0 mg/L. Over about 20 days of operation, the bilge station SVI drops below 150, and within the subsequent 150 days, the SVI is less than 150.
Example 22: experiment for eliminating viscous swelling of sludge of sebacic acid wastewater
And (3) treating the sebacic acid wastewater by a certain sewage treatment station, wherein the inlet water COD is 1400-2400 mg/L, the biochemical process is anoxic/aerobic, the residence time of an adjusting tank is 10h, the residence time of an anoxic tank is 7h, the residence time of an aerobic tank is 15h, the sludge concentration is 5500mg/L, the SVI exceeds 500, and the secondary sedimentation tank floats mud seriously.
The viscosity swelling eliminating measures include that 50mg/L polysaccharase is added into a ① biochemical pond, aeration is carried out, dissolved oxygen is controlled to be 0.1-0.5 mg/L, after the dissolved oxygen is recovered to be 1.0mg/L, 25mg/L polysaccharase and protease are added respectively, aeration is carried out, 0.1-0.5 mg/L dissolved oxygen is controlled to be 0.1-0.0 mg/L, the change of sludge settleability and viscosity is measured, ② dry corn pulp powder is added into intake water, the concentration is 20% of COD of the intake water, 50mg/L polysaccharase is added at the same time, the adjustment of 35 is carried out, the viscosity of the sludge in the biochemical pond is successfully reduced, SVI is reduced to be less than 120, and the sludge dewatering performance is improved.
Example 23: experiment for eliminating viscous swelling of sludge of sebacic acid high-salt-content wastewater
A high-salinity wastewater treatment pilot plant is used for treating sebacic acid high-salinity wastewater, the COD of inlet water is 4000-5000 mg/L, the total salt is 5-15%, the biochemical process is hydrolytic acidification and aerobic, the hydrolytic acidification lasts for 24 hours, and the aerobic stay time is 48 hours. The sludge in the aerobic pool is expanded viscously, and the SVI exceeds 300.
Viscous swell elimination: 5kg of clay is added into the aerobic tank, and then the clay leaching liquor is added for 3 times every day, 5L of the clay leaching liquor is added every time, and other technological parameters are kept unchanged. After 10d of debugging operation, the SVI is reduced to below 200, and after 10 days, the SVI is reduced to below 150, and the COD of the effluent is lower.
Example 24: experiment for eliminating sludge viscosity swelling of epoxy chloropropane high-salt wastewater
The wastewater treatment system for epoxy chloropropane is characterized in that the TOC of inlet water is 1000-1200 mg/L, the salt concentration is 10-12%, the biochemical process is aerobic, the aerobic retention time is 24h, and the sludge concentration is 3000 mg/L. The biochemical system generates sludge viscosity expansion, SVI exceeds 300, and the higher the sludge load, the more serious the sludge viscosity expansion.
Sludge bulking elimination measures: corn steep liquor dry powder with TOC of 200mg/L, molasses powder or peptone are added, dissolved oxygen is controlled to be 2.0-3.0 mg/L, and sludge load is less than or equal to 0.1 kgTOC/(kgMLSS.d). After 15d debugging, the SVI is reduced to below 200, after 20d debugging, the SVI is reduced to below 150, and after 30d debugging, the SVI is reduced to below 120.
Example 25: experiment for eliminating sludge viscosity swelling of epoxy chloropropane high-salt wastewater
The wastewater treatment system for epoxy chloropropane is characterized in that the TOC of inlet water is 1000-1200 mg/L, the salt concentration is 10-12%, the biochemical process is aerobic, the aerobic retention time is 24h, and the sludge concentration is 3000 mg/L. The biochemical system generates sludge viscosity expansion, SVI exceeds 300, and the higher the sludge load, the more serious the sludge viscosity expansion.
Sludge bulking elimination measures: adding corn steep liquor dry powder with TOC of 200mg/L, adding high-activity halophilic sludge to increase the sludge concentration to 12000mg/L, controlling the dissolved oxygen to be 2.0-3.0 mg/L, and controlling the sludge load to be less than or equal to 0.1 kgTOC/(kgMLSS). After 10d debugging, the SVI is reduced to below 200, after 15d debugging, the SVI is reduced to below 150, and after 20d debugging, the SVI is reduced to below 120.
Example 26: experiment for eliminating sludge viscosity swelling of epoxy chloropropane high-salt wastewater
The wastewater treatment system for epoxy chloropropane is characterized in that the TOC of inlet water is 1000-1200 mg/L, the salt concentration is 10-12%, the biochemical process is aerobic, the aerobic retention time is 24h, and the sludge concentration is 3000 mg/L. The biochemical system generates sludge viscosity expansion, SVI exceeds 300, and the higher the sludge load, the more serious the sludge viscosity expansion.
Sludge bulking elimination measures: adding biological rope filler, adding 100mg/L corn steep liquor dry powder into inlet water, and after about 7 days, completely attaching sludge on the surface of the filler, and completely converting a biochemical system from an activated sludge method to a biofilm method.
Example 27: experiment for eliminating sludge viscosity swelling of epoxy chloropropane high-salt wastewater
The wastewater treatment system for epoxy chloropropane is characterized in that the TOC of inlet water is 1000-1200 mg/L, the salt concentration is 10-12%, the biochemical process is aerobic, the aerobic retention time is 24h, and the sludge concentration is 3000 mg/L. The biochemical system generates sludge viscosity expansion, SVI exceeds 300, and the higher the sludge load, the more serious the sludge viscosity expansion.
Sludge bulking elimination measures: adding natural fiber filler, adding 100mg/L corn steep liquor dry powder into inlet water, and after about 2 days, completely attaching sludge to the surface of the carbon fiber filler, wherein the biochemical system is completely converted from an activated sludge method to a biofilm method.
Claims (1)
1. A method for eliminating viscous swelling of activated sludge in a biochemical system is characterized by comprising the following steps: treating sebacic acid wastewater, wherein the COD of inlet water is 1400-2400 mg/L, the biochemical process is anoxic/aerobic, the residence time of an adjusting tank is 10 hours, the residence time of an anoxic tank is 7 hours, the residence time of an aerobic tank is 15 hours, the sludge concentration is 5500mg/L, the SVI exceeds 500, and the sludge floating in a secondary sedimentation tank is serious;
viscous swell elimination: adding a filler and an aeration system into the regulating tank, modifying the regulating tank into an acidification regulating tank, operating the anoxic tank according to aeration, and performing micro-aerobic hydrolysis acidification and aerobic process after modification; meanwhile, 1/2 is discharged from the existing sludge in the biochemical tank, and the sludge in the domestic sewage plant is supplemented to the sludge concentration of more than 6000 mg/L; the micro-aerobic acidification adjusting tank controls the dissolved oxygen to be 0.3-0.5 mg/L, and the aerobic tank controls the dissolved oxygen to be 1.0-2.0 mg/L.
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